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The Graphical Network Simulator 3 (GNS3) program allows you to create network topologies using network devices such as virtual switches, routers on your computer.
The GNS3 program uses mostly Cisco exams and is more specific than the Cisco Packet Tracer program.
For more information about GNS3, please refer to the following link.
Cisco Packet Tracer 8.1 enables Packet Tracer Tutored Activities (PTTA), a new type of activity that provides hints to the learner along the way if they want them. Packet Tracer Tutored Activities (PTTA) are designed to provide a more personalized and equitable learning experience. In addition, Cisco Packet Tracer 8.1 includes bug fixes and improvements on accessibility, usability, and security.